kernel/drivers/staging/rtl8712/rtl871x_xmit.c

   1 /******************************************************************************
   2  * rtl871x_xmit.c
   3  *
   4  * Copyright(c) 2007 - 2010 Realtek Corporation. All rights reserved.
   5  * Linux device driver for RTL8192SU
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of version 2 of the GNU General Public License as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  19  *
  20  * Modifications for inclusion into the Linux staging tree are
  21  * Copyright(c) 2010 Larry Finger. All rights reserved.
  22  *
  23  * Contact information:
  24  * WLAN FAE <wlanfae@realtek.com>
  25  * Larry Finger <Larry.Finger@lwfinger.net>
  26  *
  27  ******************************************************************************/
  28
  29 #define _RTL871X_XMIT_C_
  30
  31 #include "osdep_service.h"
  32 #include "drv_types.h"
  33 #include "wifi.h"
  34 #include "osdep_intf.h"
  35 #include "usb_ops.h"
  36
  37
  38 static const u8 P802_1H_OUI[P80211_OUI_LEN] = {0x00, 0x00, 0xf8};
  39 static const u8 RFC1042_OUI[P80211_OUI_LEN] = {0x00, 0x00, 0x00};
  40 static void init_hwxmits(struct hw_xmit *phwxmit, sint entry);
  41 static void alloc_hwxmits(struct _adapter *padapter);
  42 static void free_hwxmits(struct _adapter *padapter);
  43
  44 static void _init_txservq(struct tx_servq *ptxservq)
  45 {
  46         INIT_LIST_HEAD(&ptxservq->tx_pending);
  47         _init_queue(&ptxservq->sta_pending);
  48         ptxservq->qcnt = 0;
  49 }
  50
  51 void _r8712_init_sta_xmit_priv(struct sta_xmit_priv *psta_xmitpriv)
  52 {
  53         memset((unsigned char *)psta_xmitpriv, 0,
  54                  sizeof(struct sta_xmit_priv));
  55         spin_lock_init(&psta_xmitpriv->lock);
  56         _init_txservq(&psta_xmitpriv->be_q);
  57         _init_txservq(&psta_xmitpriv->bk_q);
  58         _init_txservq(&psta_xmitpriv->vi_q);
  59         _init_txservq(&psta_xmitpriv->vo_q);
  60         INIT_LIST_HEAD(&psta_xmitpriv->legacy_dz);
  61         INIT_LIST_HEAD(&psta_xmitpriv->apsd);
  62 }
  63
  64 sint _r8712_init_xmit_priv(struct xmit_priv *pxmitpriv,
  65                            struct _adapter *padapter)
  66 {
  67         sint i;
  68         struct xmit_buf *pxmitbuf;
  69         struct xmit_frame *pxframe;
  70
  71         memset((unsigned char *)pxmitpriv, 0, sizeof(struct xmit_priv));
  72         spin_lock_init(&pxmitpriv->lock);
  73         /*
  74         Please insert all the queue initialization using _init_queue below
  75         */
  76         pxmitpriv->adapter = padapter;
  77         _init_queue(&pxmitpriv->be_pending);
  78         _init_queue(&pxmitpriv->bk_pending);
  79         _init_queue(&pxmitpriv->vi_pending);
  80         _init_queue(&pxmitpriv->vo_pending);
  81         _init_queue(&pxmitpriv->bm_pending);
  82         _init_queue(&pxmitpriv->legacy_dz_queue);
  83         _init_queue(&pxmitpriv->apsd_queue);
  84         _init_queue(&pxmitpriv->free_xmit_queue);
  85         /*
  86         Please allocate memory with the sz = (struct xmit_frame) * NR_XMITFRAME,
  87         and initialize free_xmit_frame below.
  88         Please also apply  free_txobj to link_up all the xmit_frames...
  89         */
  90         pxmitpriv->pallocated_frame_buf = kmalloc(NR_XMITFRAME * sizeof(struct xmit_frame) + 4,
  91                                                   GFP_ATOMIC);
  92         if (pxmitpriv->pallocated_frame_buf == NULL) {
  93                 pxmitpriv->pxmit_frame_buf = NULL;
  94                 return _FAIL;
  95         }
  96         pxmitpriv->pxmit_frame_buf = pxmitpriv->pallocated_frame_buf + 4 -
  97                         ((addr_t) (pxmitpriv->pallocated_frame_buf) & 3);
  98         pxframe = (struct xmit_frame *) pxmitpriv->pxmit_frame_buf;
  99         for (i = 0; i < NR_XMITFRAME; i++) {
 100                 INIT_LIST_HEAD(&(pxframe->list));
 101                 pxframe->padapter = padapter;
 102                 pxframe->frame_tag = DATA_FRAMETAG;
 103                 pxframe->pkt = NULL;
 104                 pxframe->buf_addr = NULL;
 105                 pxframe->pxmitbuf = NULL;
 106                 list_add_tail(&(pxframe->list),
 107                                  &(pxmitpriv->free_xmit_queue.queue));
 108                 pxframe++;
 109         }
 110         pxmitpriv->free_xmitframe_cnt = NR_XMITFRAME;
 111         /*
 112                 init xmit hw_txqueue
 113         */
 114         _r8712_init_hw_txqueue(&pxmitpriv->be_txqueue, BE_QUEUE_INX);
 115         _r8712_init_hw_txqueue(&pxmitpriv->bk_txqueue, BK_QUEUE_INX);
 116         _r8712_init_hw_txqueue(&pxmitpriv->vi_txqueue, VI_QUEUE_INX);
 117         _r8712_init_hw_txqueue(&pxmitpriv->vo_txqueue, VO_QUEUE_INX);
 118         _r8712_init_hw_txqueue(&pxmitpriv->bmc_txqueue, BMC_QUEUE_INX);
 119         pxmitpriv->frag_len = MAX_FRAG_THRESHOLD;
 120         pxmitpriv->txirp_cnt = 1;
 121         /*per AC pending irp*/
 122         pxmitpriv->beq_cnt = 0;
 123         pxmitpriv->bkq_cnt = 0;
 124         pxmitpriv->viq_cnt = 0;
 125         pxmitpriv->voq_cnt = 0;
 126         /*init xmit_buf*/
 127         _init_queue(&pxmitpriv->free_xmitbuf_queue);
 128         _init_queue(&pxmitpriv->pending_xmitbuf_queue);
 129         pxmitpriv->pallocated_xmitbuf = kmalloc(NR_XMITBUFF * sizeof(struct xmit_buf) + 4,
 130                                                 GFP_ATOMIC);
 131         if (pxmitpriv->pallocated_xmitbuf  == NULL)
 132                 return _FAIL;
 133         pxmitpriv->pxmitbuf = pxmitpriv->pallocated_xmitbuf + 4 -
 134                               ((addr_t)(pxmitpriv->pallocated_xmitbuf) & 3);
 135         pxmitbuf = (struct xmit_buf *)pxmitpriv->pxmitbuf;
 136         for (i = 0; i < NR_XMITBUFF; i++) {
 137                 INIT_LIST_HEAD(&pxmitbuf->list);
 138                 pxmitbuf->pallocated_buf = kmalloc(MAX_XMITBUF_SZ + XMITBUF_ALIGN_SZ,
 139                                                    GFP_ATOMIC);
 140                 if (pxmitbuf->pallocated_buf == NULL)
 141                         return _FAIL;
 142                 pxmitbuf->pbuf = pxmitbuf->pallocated_buf + XMITBUF_ALIGN_SZ -
 143                                  ((addr_t) (pxmitbuf->pallocated_buf) &
 144                                  (XMITBUF_ALIGN_SZ - 1));
 145                 r8712_xmit_resource_alloc(padapter, pxmitbuf);
 146                 list_add_tail(&pxmitbuf->list,
 147                                  &(pxmitpriv->free_xmitbuf_queue.queue));
 148                 pxmitbuf++;
 149         }
 150         pxmitpriv->free_xmitbuf_cnt = NR_XMITBUFF;
 151         INIT_WORK(&padapter->wkFilterRxFF0, r8712_SetFilter);
 152         alloc_hwxmits(padapter);
 153         init_hwxmits(pxmitpriv->hwxmits, pxmitpriv->hwxmit_entry);
 154         tasklet_init(&pxmitpriv->xmit_tasklet,
 155                 (void(*)(unsigned long))r8712_xmit_bh,
 156                 (unsigned long)padapter);
 157         return _SUCCESS;
 158 }
 159
 160 void _free_xmit_priv(struct xmit_priv *pxmitpriv)
 161 {
 162         int i;
 163         struct _adapter *padapter = pxmitpriv->adapter;
 164         struct xmit_frame *pxmitframe = (struct xmit_frame *)
 165                                         pxmitpriv->pxmit_frame_buf;
 166         struct xmit_buf *pxmitbuf = (struct xmit_buf *)pxmitpriv->pxmitbuf;
 167
 168         if (pxmitpriv->pxmit_frame_buf == NULL)
 169                 return;
 170         for (i = 0; i < NR_XMITFRAME; i++) {
 171                 r8712_xmit_complete(padapter, pxmitframe);
 172                 pxmitframe++;
 173         }
 174         for (i = 0; i < NR_XMITBUFF; i++) {
 175                 r8712_xmit_resource_free(padapter, pxmitbuf);
 176                 kfree(pxmitbuf->pallocated_buf);
 177                 pxmitbuf++;
 178         }
 179         kfree(pxmitpriv->pallocated_frame_buf);
 180         kfree(pxmitpriv->pallocated_xmitbuf);
 181         free_hwxmits(padapter);
 182 }
 183
 184 sint r8712_update_attrib(struct _adapter *padapter, _pkt *pkt,
 185                    struct pkt_attrib *pattrib)
 186 {
 187         struct pkt_file pktfile;
 188         struct sta_info *psta = NULL;
 189         struct ethhdr etherhdr;
 190
 191         struct tx_cmd txdesc;
 192
 193         sint bmcast;
 194         struct sta_priv         *pstapriv = &padapter->stapriv;
 195         struct security_priv    *psecuritypriv = &padapter->securitypriv;
 196         struct mlme_priv        *pmlmepriv = &padapter->mlmepriv;
 197         struct qos_priv         *pqospriv = &pmlmepriv->qospriv;
 198
 199         _r8712_open_pktfile(pkt, &pktfile);
 200
 201         _r8712_pktfile_read(&pktfile, (unsigned char *)&etherhdr, ETH_HLEN);
 202
 203         pattrib->ether_type = ntohs(etherhdr.h_proto);
 204
 205 {
 206         /*If driver xmit ARP packet, driver can set ps mode to initial
 207          * setting. It stands for getting DHCP or fix IP.*/
 208         if (pattrib->ether_type == 0x0806) {
 209                 if (padapter->pwrctrlpriv.pwr_mode !=
 210                     padapter->registrypriv.power_mgnt) {
 211                         del_timer_sync(&pmlmepriv->dhcp_timer);
 212                         r8712_set_ps_mode(padapter, padapter->registrypriv.
 213                                 power_mgnt, padapter->registrypriv.smart_ps);
 214                 }
 215         }
 216 }
 217         memcpy(pattrib->dst, &etherhdr.h_dest, ETH_ALEN);
 218         memcpy(pattrib->src, &etherhdr.h_source, ETH_ALEN);
 219         pattrib->pctrl = 0;
 220         if ((check_fwstate(pmlmepriv, WIFI_ADHOC_STATE) == true) ||
 221             (check_fwstate(pmlmepriv, WIFI_ADHOC_MASTER_STATE) == true)) {
 222                 memcpy(pattrib->ra, pattrib->dst, ETH_ALEN);
 223                 memcpy(pattrib->ta, pattrib->src, ETH_ALEN);
 224         } else if (check_fwstate(pmlmepriv, WIFI_STATION_STATE)) {
 225                 memcpy(pattrib->ra, get_bssid(pmlmepriv), ETH_ALEN);
 226                 memcpy(pattrib->ta, pattrib->src, ETH_ALEN);
 227         } else if (check_fwstate(pmlmepriv, WIFI_AP_STATE)) {
 228                 memcpy(pattrib->ra, pattrib->dst, ETH_ALEN);
 229                 memcpy(pattrib->ta, get_bssid(pmlmepriv), ETH_ALEN);
 230         } else if (check_fwstate(pmlmepriv, WIFI_MP_STATE) == true) {
 231                 /*firstly, filter packet not belongs to mp*/
 232                 if (pattrib->ether_type != 0x8712)
 233                         return _FAIL;
 234                 /* for mp storing the txcmd per packet,
 235                  * according to the info of txcmd to update pattrib */
 236                 /*get MP_TXDESC_SIZE bytes txcmd per packet*/
 237                 _r8712_pktfile_read(&pktfile, (u8 *)&txdesc, TXDESC_SIZE);
 238                 memcpy(pattrib->ra, pattrib->dst, ETH_ALEN);
 239                 memcpy(pattrib->ta, pattrib->src, ETH_ALEN);
 240                 pattrib->pctrl = 1;
 241         }
 242         /* r8712_xmitframe_coalesce() overwrite this!*/
 243         pattrib->pktlen = pktfile.pkt_len;
 244         if (ETH_P_IP == pattrib->ether_type) {
 245                 /* The following is for DHCP and ARP packet, we use cck1M to
 246                  * tx these packets and let LPS awake some time
 247                  * to prevent DHCP protocol fail */
 248                 u8 tmp[24];
 249
 250                 _r8712_pktfile_read(&pktfile, &tmp[0], 24);
 251                 pattrib->dhcp_pkt = 0;
 252                 if (pktfile.pkt_len > 282) {/*MINIMUM_DHCP_PACKET_SIZE)*/
 253                         if (ETH_P_IP == pattrib->ether_type) {/* IP header*/
 254                                 if (((tmp[21] == 68) && (tmp[23] == 67)) ||
 255                                         ((tmp[21] == 67) && (tmp[23] == 68))) {
 256                                         /* 68 : UDP BOOTP client
 257                                          * 67 : UDP BOOTP server
 258                                          * Use low rate to send DHCP packet.*/
 259                                         pattrib->dhcp_pkt = 1;
 260                                 }
 261                         }
 262                 }
 263         }
 264         bmcast = IS_MCAST(pattrib->ra);
 265         /* get sta_info*/
 266         if (bmcast) {
 267                 psta = r8712_get_bcmc_stainfo(padapter);
 268                 pattrib->mac_id = 4;
 269         } else {
 270                 if (check_fwstate(pmlmepriv, WIFI_MP_STATE) == true) {
 271                         psta = r8712_get_stainfo(pstapriv,
 272                                                  get_bssid(pmlmepriv));
 273                         pattrib->mac_id = 5;
 274                 } else {
 275                         psta = r8712_get_stainfo(pstapriv, pattrib->ra);
 276                         if (psta == NULL)  /* drop the pkt */
 277                                 return _FAIL;
 278                         if (check_fwstate(pmlmepriv, WIFI_STATION_STATE))
 279                                 pattrib->mac_id = 5;
 280                         else
 281                                 pattrib->mac_id = psta->mac_id;
 282                 }
 283         }
 284
 285         if (psta) {
 286                 pattrib->psta = psta;
 287         } else {
 288                 /* if we cannot get psta => drrp the pkt */
 289                 return _FAIL;
 290         }
 291
 292         pattrib->ack_policy = 0;
 293         /* get ether_hdr_len */
 294         pattrib->pkt_hdrlen = ETH_HLEN;
 295
 296         if (pqospriv->qos_option)
 297                 r8712_set_qos(&pktfile, pattrib);
 298         else {
 299                 pattrib->hdrlen = WLAN_HDR_A3_LEN;
 300                 pattrib->subtype = WIFI_DATA_TYPE;
 301                 pattrib->priority = 0;
 302         }
 303         if (psta->ieee8021x_blocked == true) {
 304                 pattrib->encrypt = 0;
 305                 if ((pattrib->ether_type != 0x888e) &&
 306                     (check_fwstate(pmlmepriv, WIFI_MP_STATE) == false))
 307                         return _FAIL;
 308         } else
 309                 GET_ENCRY_ALGO(psecuritypriv, psta, pattrib->encrypt, bmcast);
 310         switch (pattrib->encrypt) {
 311         case _WEP40_:
 312         case _WEP104_:
 313                 pattrib->iv_len = 4;
 314                 pattrib->icv_len = 4;
 315                 break;
 316         case _TKIP_:
 317                 pattrib->iv_len = 8;
 318                 pattrib->icv_len = 4;
 319                 if (padapter->securitypriv.busetkipkey == _FAIL)
 320                         return _FAIL;
 321                 break;
 322         case _AES_:
 323                 pattrib->iv_len = 8;
 324                 pattrib->icv_len = 8;
 325                 break;
 326         default:
 327                 pattrib->iv_len = 0;
 328                 pattrib->icv_len = 0;
 329                 break;
 330         }
 331
 332         if (pattrib->encrypt &&
 333             ((padapter->securitypriv.sw_encrypt == true) ||
 334              (psecuritypriv->hw_decrypted == false)))
 335                 pattrib->bswenc = true;
 336         else
 337                 pattrib->bswenc = false;
 338         /* if in MP_STATE, update pkt_attrib from mp_txcmd, and overwrite
 339          * some settings above.*/
 340         if (check_fwstate(pmlmepriv, WIFI_MP_STATE) == true)
 341                 pattrib->priority = (txdesc.txdw1 >> QSEL_SHT) & 0x1f;
 342         return _SUCCESS;
 343 }
 344
 345 static sint xmitframe_addmic(struct _adapter *padapter,
 346                              struct xmit_frame *pxmitframe)
 347 {
 348         u32     curfragnum, length;
 349         u8      *pframe, *payload, mic[8];
 350         struct  mic_data micdata;
 351         struct  sta_info *stainfo;
 352         struct  qos_priv *pqospriv = &(padapter->mlmepriv.qospriv);
 353         struct  pkt_attrib  *pattrib = &pxmitframe->attrib;
 354         struct  security_priv *psecuritypriv = &padapter->securitypriv;
 355         struct  xmit_priv *pxmitpriv = &padapter->xmitpriv;
 356         u8 priority[4] = {0x0, 0x0, 0x0, 0x0};
 357         sint bmcst = IS_MCAST(pattrib->ra);
 358
 359         if (pattrib->psta)
 360                 stainfo = pattrib->psta;
 361         else
 362                 stainfo = r8712_get_stainfo(&padapter->stapriv,
 363                                             &pattrib->ra[0]);
 364         if (pattrib->encrypt == _TKIP_) {
 365                 /*encode mic code*/
 366                 if (stainfo != NULL) {
 367                         u8 null_key[16] = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
 368                                            0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
 369                                            0x0, 0x0};
 370                         pframe = pxmitframe->buf_addr + TXDESC_OFFSET;
 371                         if (bmcst) {
 372                                 if (!memcmp(psecuritypriv->XGrptxmickey
 373                                    [psecuritypriv->XGrpKeyid].skey,
 374                                    null_key, 16))
 375                                         return _FAIL;
 376                                 /*start to calculate the mic code*/
 377                                 r8712_secmicsetkey(&micdata,
 378                                          psecuritypriv->
 379                                          XGrptxmickey[psecuritypriv->
 380                                         XGrpKeyid].skey);
 381                         } else {
 382                                 if (!memcmp(&stainfo->tkiptxmickey.skey[0],
 383                                             null_key, 16))
 384                                         return _FAIL;
 385                                 /* start to calculate the mic code */
 386                                 r8712_secmicsetkey(&micdata,
 387                                              &stainfo->tkiptxmickey.skey[0]);
 388                         }
 389                         if (pframe[1] & 1) {   /* ToDS==1 */
 390                                 r8712_secmicappend(&micdata,
 391                                                    &pframe[16], 6); /*DA*/
 392                                 if (pframe[1]&2)  /* From Ds==1 */
 393                                         r8712_secmicappend(&micdata,
 394                                                            &pframe[24], 6);
 395                                 else
 396                                         r8712_secmicappend(&micdata,
 397                                                            &pframe[10], 6);
 398                         } else {        /* ToDS==0 */
 399                                 r8712_secmicappend(&micdata,
 400                                                    &pframe[4], 6); /* DA */
 401                                 if (pframe[1]&2)  /* From Ds==1 */
 402                                         r8712_secmicappend(&micdata,
 403                                                            &pframe[16], 6);
 404                                 else
 405                                         r8712_secmicappend(&micdata,
 406                                                            &pframe[10], 6);
 407                         }
 408                         if (pqospriv->qos_option == 1)
 409                                         priority[0] = (u8)pxmitframe->
 410                                                       attrib.priority;
 411                         r8712_secmicappend(&micdata, &priority[0], 4);
 412                         payload = pframe;
 413                         for (curfragnum = 0; curfragnum < pattrib->nr_frags;
 414                              curfragnum++) {
 415                                 payload = (u8 *)RND4((addr_t)(payload));
 416                                 payload = payload+pattrib->
 417                                           hdrlen+pattrib->iv_len;
 418                                 if ((curfragnum + 1) == pattrib->nr_frags) {
 419                                         length = pattrib->last_txcmdsz -
 420                                                   pattrib->hdrlen -
 421                                                   pattrib->iv_len -
 422                                                   ((psecuritypriv->sw_encrypt)
 423                                                   ? pattrib->icv_len : 0);
 424                                         r8712_secmicappend(&micdata, payload,
 425                                                            length);
 426                                         payload = payload+length;
 427                                 } else{
 428                                         length = pxmitpriv->frag_len -
 429                                             pattrib->hdrlen-pattrib->iv_len -
 430                                             ((psecuritypriv->sw_encrypt) ?
 431                                             pattrib->icv_len : 0);
 432                                         r8712_secmicappend(&micdata, payload,
 433                                                            length);
 434                                         payload = payload + length +
 435                                                   pattrib->icv_len;
 436                                 }
 437                         }
 438                         r8712_secgetmic(&micdata, &(mic[0]));
 439                         /* add mic code  and add the mic code length in
 440                          * last_txcmdsz */
 441                         memcpy(payload, &(mic[0]), 8);
 442                         pattrib->last_txcmdsz += 8;
 443                         payload = payload-pattrib->last_txcmdsz + 8;
 444                 }
 445         }
 446         return _SUCCESS;
 447 }
 448
 449 static sint xmitframe_swencrypt(struct _adapter *padapter,
 450                                 struct xmit_frame *pxmitframe)
 451 {
 452         struct pkt_attrib       *pattrib = &pxmitframe->attrib;
 453
 454         if (pattrib->bswenc) {
 455                 switch (pattrib->encrypt) {
 456                 case _WEP40_:
 457                 case _WEP104_:
 458                         r8712_wep_encrypt(padapter, (u8 *)pxmitframe);
 459                         break;
 460                 case _TKIP_:
 461                         r8712_tkip_encrypt(padapter, (u8 *)pxmitframe);
 462                         break;
 463                 case _AES_:
 464                         r8712_aes_encrypt(padapter, (u8 *)pxmitframe);
 465                         break;
 466                 default:
 467                                 break;
 468                 }
 469         }
 470         return _SUCCESS;
 471 }
 472
 473 static sint make_wlanhdr(struct _adapter *padapter, u8 *hdr,
 474                          struct pkt_attrib *pattrib)
 475 {
 476         u16 *qc;
 477
 478         struct ieee80211_hdr *pwlanhdr = (struct ieee80211_hdr *)hdr;
 479         struct mlme_priv *pmlmepriv = &padapter->mlmepriv;
 480         struct qos_priv *pqospriv = &pmlmepriv->qospriv;
 481         u16 *fctrl = &pwlanhdr->frame_ctl;
 482
 483         memset(hdr, 0, WLANHDR_OFFSET);
 484         SetFrameSubType(fctrl, pattrib->subtype);
 485         if (pattrib->subtype & WIFI_DATA_TYPE) {
 486                 if (check_fwstate(pmlmepriv,  WIFI_STATION_STATE) == true) {
 487                         /* to_ds = 1, fr_ds = 0; */
 488                         SetToDs(fctrl);
 489                         memcpy(pwlanhdr->addr1, get_bssid(pmlmepriv),
 490                                 ETH_ALEN);
 491                         memcpy(pwlanhdr->addr2, pattrib->src, ETH_ALEN);
 492                         memcpy(pwlanhdr->addr3, pattrib->dst, ETH_ALEN);
 493                 } else if (check_fwstate(pmlmepriv, WIFI_AP_STATE) == true) {
 494                         /* to_ds = 0, fr_ds = 1; */
 495                         SetFrDs(fctrl);
 496                         memcpy(pwlanhdr->addr1, pattrib->dst, ETH_ALEN);
 497                         memcpy(pwlanhdr->addr2, get_bssid(pmlmepriv),
 498                                 ETH_ALEN);
 499                         memcpy(pwlanhdr->addr3, pattrib->src, ETH_ALEN);
 500                 } else if ((check_fwstate(pmlmepriv, WIFI_ADHOC_STATE) == true)
 501                            || (check_fwstate(pmlmepriv, WIFI_ADHOC_MASTER_STATE)
 502                            == true)) {
 503                         memcpy(pwlanhdr->addr1, pattrib->dst, ETH_ALEN);
 504                         memcpy(pwlanhdr->addr2, pattrib->src, ETH_ALEN);
 505                         memcpy(pwlanhdr->addr3, get_bssid(pmlmepriv),
 506                                 ETH_ALEN);
 507                 } else if (check_fwstate(pmlmepriv, WIFI_MP_STATE) == true) {
 508                         memcpy(pwlanhdr->addr1, pattrib->dst, ETH_ALEN);
 509                         memcpy(pwlanhdr->addr2, pattrib->src, ETH_ALEN);
 510                         memcpy(pwlanhdr->addr3, get_bssid(pmlmepriv),
 511                                 ETH_ALEN);
 512                 } else
 513                         return _FAIL;
 514
 515                 if (pattrib->encrypt)
 516                         SetPrivacy(fctrl);
 517                 if (pqospriv->qos_option) {
 518                         qc = (unsigned short *)(hdr + pattrib->hdrlen - 2);
 519                         if (pattrib->priority)
 520                                 SetPriority(qc, pattrib->priority);
 521                         SetAckpolicy(qc, pattrib->ack_policy);
 522                 }
 523                 /* TODO: fill HT Control Field */
 524                 /* Update Seq Num will be handled by f/w */
 525                 {
 526                         struct sta_info *psta;
 527                         sint bmcst = IS_MCAST(pattrib->ra);
 528
 529                         if (pattrib->psta)
 530                                 psta = pattrib->psta;
 531                         else {
 532                                 if (bmcst)
 533                                         psta = r8712_get_bcmc_stainfo(padapter);
 534                                 else
 535                                         psta =
 536                                          r8712_get_stainfo(&padapter->stapriv,
 537                                          pattrib->ra);
 538                         }
 539                         if (psta) {
 540                                 psta->sta_xmitpriv.txseq_tid
 541                                                   [pattrib->priority]++;
 542                                 psta->sta_xmitpriv.txseq_tid[pattrib->priority]
 543                                                    &= 0xFFF;
 544                                 pattrib->seqnum = psta->sta_xmitpriv.
 545                                                   txseq_tid[pattrib->priority];
 546                                 SetSeqNum(hdr, pattrib->seqnum);
 547                         }
 548                 }
 549         }
 550         return _SUCCESS;
 551 }
 552
 553 static sint r8712_put_snap(u8 *data, u16 h_proto)
 554 {
 555         struct ieee80211_snap_hdr *snap;
 556         const u8 *oui;
 557
 558         snap = (struct ieee80211_snap_hdr *)data;
 559         snap->dsap = 0xaa;
 560         snap->ssap = 0xaa;
 561         snap->ctrl = 0x03;
 562         if (h_proto == 0x8137 || h_proto == 0x80f3)
 563                 oui = P802_1H_OUI;
 564         else
 565                 oui = RFC1042_OUI;
 566         snap->oui[0] = oui[0];
 567         snap->oui[1] = oui[1];
 568         snap->oui[2] = oui[2];
 569         *(u16 *)(data + SNAP_SIZE) = htons(h_proto);
 570         return SNAP_SIZE + sizeof(u16);
 571 }
 572
 573 /*
 574  * This sub-routine will perform all the following:
 575  * 1. remove 802.3 header.
 576  * 2. create wlan_header, based on the info in pxmitframe
 577  * 3. append sta's iv/ext-iv
 578  * 4. append LLC
 579  * 5. move frag chunk from pframe to pxmitframe->mem
 580  * 6. apply sw-encrypt, if necessary.
 581  */
 582 sint r8712_xmitframe_coalesce(struct _adapter *padapter, _pkt *pkt,
 583                         struct xmit_frame *pxmitframe)
 584 {
 585         struct pkt_file pktfile;
 586
 587         sint    frg_len, mpdu_len, llc_sz;
 588         u32     mem_sz;
 589         u8      frg_inx;
 590         addr_t addr;
 591         u8 *pframe, *mem_start, *ptxdesc;
 592         struct sta_info         *psta;
 593         struct security_priv    *psecuritypriv = &padapter->securitypriv;
 594         struct mlme_priv        *pmlmepriv = &padapter->mlmepriv;
 595         struct xmit_priv        *pxmitpriv = &padapter->xmitpriv;
 596         struct pkt_attrib       *pattrib = &pxmitframe->attrib;
 597         u8 *pbuf_start;
 598         sint bmcst = IS_MCAST(pattrib->ra);
 599
 600         if (pattrib->psta == NULL)
 601                 return _FAIL;
 602         psta = pattrib->psta;
 603         if (pxmitframe->buf_addr == NULL)
 604                 return _FAIL;
 605         pbuf_start = pxmitframe->buf_addr;
 606         ptxdesc = pbuf_start;
 607         mem_start = pbuf_start + TXDESC_OFFSET;
 608         if (make_wlanhdr(padapter, mem_start, pattrib) == _FAIL)
 609                 return _FAIL;
 610         _r8712_open_pktfile(pkt, &pktfile);
 611         _r8712_pktfile_read(&pktfile, NULL, (uint) pattrib->pkt_hdrlen);
 612         if (check_fwstate(pmlmepriv, WIFI_MP_STATE) == true) {
 613                 /* truncate TXDESC_SIZE bytes txcmd if at mp mode for 871x */
 614                 if (pattrib->ether_type == 0x8712) {
 615                         /* take care -  update_txdesc overwrite this */
 616                         _r8712_pktfile_read(&pktfile, ptxdesc, TXDESC_SIZE);
 617                 }
 618         }
 619         pattrib->pktlen = pktfile.pkt_len;
 620         frg_inx = 0;
 621         frg_len = pxmitpriv->frag_len - 4;
 622         while (1) {
 623                 llc_sz = 0;
 624                 mpdu_len = frg_len;
 625                 pframe = mem_start;
 626                 SetMFrag(mem_start);
 627                 pframe += pattrib->hdrlen;
 628                 mpdu_len -= pattrib->hdrlen;
 629                 /* adding icv, if necessary...*/
 630                 if (pattrib->iv_len) {
 631                         if (psta != NULL) {
 632                                 switch (pattrib->encrypt) {
 633                                 case _WEP40_:
 634                                 case _WEP104_:
 635                                         WEP_IV(pattrib->iv, psta->txpn,
 636                                                (u8)psecuritypriv->
 637                                                PrivacyKeyIndex);
 638                                         break;
 639                                 case _TKIP_:
 640                                         if (bmcst)
 641                                                 TKIP_IV(pattrib->iv,
 642                                                     psta->txpn,
 643                                                     (u8)psecuritypriv->
 644                                                     XGrpKeyid);
 645                                         else
 646                                                 TKIP_IV(pattrib->iv, psta->txpn,
 647                                                         0);
 648                                         break;
 649                                 case _AES_:
 650                                         if (bmcst)
 651                                                 AES_IV(pattrib->iv, psta->txpn,
 652                                                     (u8)psecuritypriv->
 653                                                     XGrpKeyid);
 654                                         else
 655                                                 AES_IV(pattrib->iv, psta->txpn,
 656                                                        0);
 657                                         break;
 658                                 }
 659                         }
 660                         memcpy(pframe, pattrib->iv, pattrib->iv_len);
 661                         pframe += pattrib->iv_len;
 662                         mpdu_len -= pattrib->iv_len;
 663                 }
 664                 if (frg_inx == 0) {
 665                         llc_sz = r8712_put_snap(pframe, pattrib->ether_type);
 666                         pframe += llc_sz;
 667                         mpdu_len -= llc_sz;
 668                 }
 669                 if ((pattrib->icv_len > 0) && (pattrib->bswenc))
 670                         mpdu_len -= pattrib->icv_len;
 671                 if (bmcst)
 672                         mem_sz = _r8712_pktfile_read(&pktfile, pframe,
 673                                  pattrib->pktlen);
 674                 else
 675                         mem_sz = _r8712_pktfile_read(&pktfile, pframe,
 676                                  mpdu_len);
 677                 pframe += mem_sz;
 678                 if ((pattrib->icv_len > 0) && (pattrib->bswenc)) {
 679                         memcpy(pframe, pattrib->icv, pattrib->icv_len);
 680                         pframe += pattrib->icv_len;
 681                 }
 682                 frg_inx++;
 683                 if (bmcst || (r8712_endofpktfile(&pktfile) == true)) {
 684                         pattrib->nr_frags = frg_inx;
 685                         pattrib->last_txcmdsz = pattrib->hdrlen +
 686                                                 pattrib->iv_len +
 687                                                 ((pattrib->nr_frags == 1) ?
 688                                                 llc_sz : 0) +
 689                                                 ((pattrib->bswenc) ?
 690                                                 pattrib->icv_len : 0) + mem_sz;
 691                         ClearMFrag(mem_start);
 692                         break;
 693                 }
 694                 addr = (addr_t)(pframe);
 695                 mem_start = (unsigned char *)RND4(addr) + TXDESC_OFFSET;
 696                 memcpy(mem_start, pbuf_start + TXDESC_OFFSET, pattrib->hdrlen);
 697         }
 698
 699         if (xmitframe_addmic(padapter, pxmitframe) == _FAIL)
 700                 return _FAIL;
 701         xmitframe_swencrypt(padapter, pxmitframe);
 702         return _SUCCESS;
 703 }
 704
 705 void r8712_update_protection(struct _adapter *padapter, u8 *ie, uint ie_len)
 706 {
 707         uint    protection;
 708         u8      *perp;
 709         sint     erp_len;
 710         struct  xmit_priv *pxmitpriv = &padapter->xmitpriv;
 711         struct  registry_priv *pregistrypriv = &padapter->registrypriv;
 712
 713         switch (pxmitpriv->vcs_setting) {
 714         case DISABLE_VCS:
 715                 pxmitpriv->vcs = NONE_VCS;
 716                 break;
 717         case ENABLE_VCS:
 718                 break;
 719         case AUTO_VCS:
 720         default:
 721                 perp = r8712_get_ie(ie, _ERPINFO_IE_, &erp_len, ie_len);
 722                 if (perp == NULL)
 723                         pxmitpriv->vcs = NONE_VCS;
 724                 else {
 725                         protection = (*(perp + 2)) & BIT(1);
 726                         if (protection) {
 727                                 if (pregistrypriv->vcs_type == RTS_CTS)
 728                                         pxmitpriv->vcs = RTS_CTS;
 729                                 else
 730                                         pxmitpriv->vcs = CTS_TO_SELF;
 731                         } else
 732                                 pxmitpriv->vcs = NONE_VCS;
 733                 }
 734                 break;
 735         }
 736 }
 737
 738 struct xmit_buf *r8712_alloc_xmitbuf(struct xmit_priv *pxmitpriv)
 739 {
 740         unsigned long irqL;
 741         struct xmit_buf *pxmitbuf =  NULL;
 742         struct list_head *plist, *phead;
 743         struct  __queue *pfree_xmitbuf_queue = &pxmitpriv->free_xmitbuf_queue;
 744
 745         spin_lock_irqsave(&pfree_xmitbuf_queue->lock, irqL);
 746         if (list_empty(&pfree_xmitbuf_queue->queue))
 747                 pxmitbuf = NULL;
 748         else {
 749                 phead = &pfree_xmitbuf_queue->queue;
 750                 plist = phead->next;
 751                 pxmitbuf = LIST_CONTAINOR(plist, struct xmit_buf, list);
 752                 list_del_init(&(pxmitbuf->list));
 753         }
 754         if (pxmitbuf !=  NULL)
 755                 pxmitpriv->free_xmitbuf_cnt--;
 756         spin_unlock_irqrestore(&pfree_xmitbuf_queue->lock, irqL);
 757         return pxmitbuf;
 758 }
 759
 760 int r8712_free_xmitbuf(struct xmit_priv *pxmitpriv, struct xmit_buf *pxmitbuf)
 761 {
 762         unsigned long irqL;
 763         struct  __queue *pfree_xmitbuf_queue = &pxmitpriv->free_xmitbuf_queue;
 764
 765         if (pxmitbuf == NULL)
 766                 return _FAIL;
 767         spin_lock_irqsave(&pfree_xmitbuf_queue->lock, irqL);
 768         list_del_init(&pxmitbuf->list);
 769         list_add_tail(&(pxmitbuf->list), &pfree_xmitbuf_queue->queue);
 770         pxmitpriv->free_xmitbuf_cnt++;
 771         spin_unlock_irqrestore(&pfree_xmitbuf_queue->lock, irqL);
 772         return _SUCCESS;
 773 }
 774
 775 /*
 776 Calling context:
 777 1. OS_TXENTRY
 778 2. RXENTRY (rx_thread or RX_ISR/RX_CallBack)
 779
 780 If we turn on USE_RXTHREAD, then, no need for critical section.
 781 Otherwise, we must use _enter/_exit critical to protect free_xmit_queue...
 782
 783 Must be very very cautious...
 784
 785 */
 786
 787 struct xmit_frame *r8712_alloc_xmitframe(struct xmit_priv *pxmitpriv)
 788 {
 789         /*
 790                 Please remember to use all the osdep_service api,
 791                 and lock/unlock or _enter/_exit critical to protect
 792                 pfree_xmit_queue
 793         */
 794         unsigned long irqL;
 795         struct xmit_frame *pxframe = NULL;
 796         struct list_head *plist, *phead;
 797         struct  __queue *pfree_xmit_queue = &pxmitpriv->free_xmit_queue;
 798
 799         spin_lock_irqsave(&pfree_xmit_queue->lock, irqL);
 800         if (list_empty(&pfree_xmit_queue->queue))
 801                 pxframe =  NULL;
 802         else {
 803                 phead = &pfree_xmit_queue->queue;
 804                 plist = phead->next;
 805                 pxframe = LIST_CONTAINOR(plist, struct xmit_frame, list);
 806                 list_del_init(&(pxframe->list));
 807         }
 808         if (pxframe !=  NULL) {
 809                 pxmitpriv->free_xmitframe_cnt--;
 810                 pxframe->buf_addr = NULL;
 811                 pxframe->pxmitbuf = NULL;
 812                 pxframe->attrib.psta = NULL;
 813                 pxframe->pkt = NULL;
 814         }
 815         spin_unlock_irqrestore(&pfree_xmit_queue->lock, irqL);
 816         return pxframe;
 817 }
 818
 819 void r8712_free_xmitframe(struct xmit_priv *pxmitpriv,
 820                           struct xmit_frame *pxmitframe)
 821 {
 822         unsigned long irqL;
 823         struct  __queue *pfree_xmit_queue = &pxmitpriv->free_xmit_queue;
 824         struct _adapter *padapter = pxmitpriv->adapter;
 825
 826         if (pxmitframe == NULL)
 827                 return;
 828         spin_lock_irqsave(&pfree_xmit_queue->lock, irqL);
 829         list_del_init(&pxmitframe->list);
 830         if (pxmitframe->pkt)
 831                 pxmitframe->pkt = NULL;
 832         list_add_tail(&pxmitframe->list, &pfree_xmit_queue->queue);
 833         pxmitpriv->free_xmitframe_cnt++;
 834         spin_unlock_irqrestore(&pfree_xmit_queue->lock, irqL);
 835         if (netif_queue_stopped(padapter->pnetdev))
 836                 netif_wake_queue(padapter->pnetdev);
 837 }
 838
 839 void r8712_free_xmitframe_ex(struct xmit_priv *pxmitpriv,
 840                       struct xmit_frame *pxmitframe)
 841 {
 842         if (pxmitframe == NULL)
 843                 return;
 844         if (pxmitframe->frame_tag == DATA_FRAMETAG)
 845                 r8712_free_xmitframe(pxmitpriv, pxmitframe);
 846 }
 847
 848 void r8712_free_xmitframe_queue(struct xmit_priv *pxmitpriv,
 849                                 struct  __queue *pframequeue)
 850 {
 851         unsigned long irqL;
 852         struct list_head *plist, *phead;
 853         struct  xmit_frame      *pxmitframe;
 854
 855         spin_lock_irqsave(&(pframequeue->lock), irqL);
 856         phead = &pframequeue->queue;
 857         plist = phead->next;
 858         while (end_of_queue_search(phead, plist) == false) {
 859                 pxmitframe = LIST_CONTAINOR(plist, struct xmit_frame, list);
 860                 plist = plist->next;
 861                 r8712_free_xmitframe(pxmitpriv, pxmitframe);
 862         }
 863         spin_unlock_irqrestore(&(pframequeue->lock), irqL);
 864 }
 865
 866 static inline struct tx_servq *get_sta_pending(struct _adapter *padapter,
 867                                                struct  __queue **ppstapending,
 868                                                struct sta_info *psta, sint up)
 869 {
 870
 871         struct tx_servq *ptxservq;
 872         struct hw_xmit *phwxmits =  padapter->xmitpriv.hwxmits;
 873
 874         switch (up) {
 875         case 1:
 876         case 2:
 877                 ptxservq = &(psta->sta_xmitpriv.bk_q);
 878                 *ppstapending = &padapter->xmitpriv.bk_pending;
 879                 (phwxmits+3)->accnt++;
 880                 break;
 881         case 4:
 882         case 5:
 883                 ptxservq = &(psta->sta_xmitpriv.vi_q);
 884                 *ppstapending = &padapter->xmitpriv.vi_pending;
 885                 (phwxmits+1)->accnt++;
 886                 break;
 887         case 6:
 888         case 7:
 889                 ptxservq = &(psta->sta_xmitpriv.vo_q);
 890                 *ppstapending = &padapter->xmitpriv.vo_pending;
 891                 (phwxmits+0)->accnt++;
 892                 break;
 893         case 0:
 894         case 3:
 895         default:
 896                 ptxservq = &(psta->sta_xmitpriv.be_q);
 897                 *ppstapending = &padapter->xmitpriv.be_pending;
 898                 (phwxmits + 2)->accnt++;
 899                 break;
 900         }
 901         return ptxservq;
 902 }
 903
 904 /*
 905  * Will enqueue pxmitframe to the proper queue, and indicate it
 906  * to xx_pending list.....
 907  */
 908 sint r8712_xmit_classifier(struct _adapter *padapter,
 909                            struct xmit_frame *pxmitframe)
 910 {
 911         unsigned long irqL0;
 912         struct  __queue *pstapending;
 913         struct sta_info *psta;
 914         struct tx_servq *ptxservq;
 915         struct pkt_attrib *pattrib = &pxmitframe->attrib;
 916         struct sta_priv *pstapriv = &padapter->stapriv;
 917         struct mlme_priv *pmlmepriv = &padapter->mlmepriv;
 918         sint bmcst = IS_MCAST(pattrib->ra);
 919
 920         if (pattrib->psta)
 921                 psta = pattrib->psta;
 922         else {
 923                 if (bmcst)
 924                         psta = r8712_get_bcmc_stainfo(padapter);
 925                 else {
 926                         if (check_fwstate(pmlmepriv, WIFI_MP_STATE) == true)
 927                                 psta = r8712_get_stainfo(pstapriv,
 928                                        get_bssid(pmlmepriv));
 929                         else
 930                                 psta = r8712_get_stainfo(pstapriv, pattrib->ra);
 931                 }
 932         }
 933         if (psta == NULL)
 934                 return _FAIL;
 935         ptxservq = get_sta_pending(padapter, &pstapending,
 936                    psta, pattrib->priority);
 937         spin_lock_irqsave(&pstapending->lock, irqL0);
 938         if (list_empty(&ptxservq->tx_pending))
 939                 list_add_tail(&ptxservq->tx_pending, &pstapending->queue);
 940         list_add_tail(&pxmitframe->list, &ptxservq->sta_pending.queue);
 941         ptxservq->qcnt++;
 942         spin_unlock_irqrestore(&pstapending->lock, irqL0);
 943         return _SUCCESS;
 944 }
 945
 946 static void alloc_hwxmits(struct _adapter *padapter)
 947 {
 948         struct hw_xmit *hwxmits;
 949         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 950
 951         pxmitpriv->hwxmit_entry = HWXMIT_ENTRY;
 952         pxmitpriv->hwxmits = kmalloc_array(pxmitpriv->hwxmit_entry,
 953                                 sizeof(struct hw_xmit), GFP_ATOMIC);
 954         if (pxmitpriv->hwxmits == NULL)
 955                 return;
 956         hwxmits = pxmitpriv->hwxmits;
 957         if (pxmitpriv->hwxmit_entry == 5) {
 958                 pxmitpriv->bmc_txqueue.head = 0;
 959                 hwxmits[0] .phwtxqueue = &pxmitpriv->bmc_txqueue;
 960                 hwxmits[0] .sta_queue = &pxmitpriv->bm_pending;
 961                 pxmitpriv->vo_txqueue.head = 0;
 962                 hwxmits[1] .phwtxqueue = &pxmitpriv->vo_txqueue;
 963                 hwxmits[1] .sta_queue = &pxmitpriv->vo_pending;
 964         pxmitpriv->vi_txqueue.head = 0;
 965                 hwxmits[2] .phwtxqueue = &pxmitpriv->vi_txqueue;
 966                 hwxmits[2] .sta_queue = &pxmitpriv->vi_pending;
 967                 pxmitpriv->bk_txqueue.head = 0;
 968                 hwxmits[3] .phwtxqueue = &pxmitpriv->bk_txqueue;
 969                 hwxmits[3] .sta_queue = &pxmitpriv->bk_pending;
 970                 pxmitpriv->be_txqueue.head = 0;
 971                 hwxmits[4] .phwtxqueue = &pxmitpriv->be_txqueue;
 972                 hwxmits[4] .sta_queue = &pxmitpriv->be_pending;
 973         } else if (pxmitpriv->hwxmit_entry == 4) {
 974                 pxmitpriv->vo_txqueue.head = 0;
 975                 hwxmits[0] .phwtxqueue = &pxmitpriv->vo_txqueue;
 976                 hwxmits[0] .sta_queue = &pxmitpriv->vo_pending;
 977                 pxmitpriv->vi_txqueue.head = 0;
 978                 hwxmits[1] .phwtxqueue = &pxmitpriv->vi_txqueue;
 979                 hwxmits[1] .sta_queue = &pxmitpriv->vi_pending;
 980                 pxmitpriv->be_txqueue.head = 0;
 981                 hwxmits[2] .phwtxqueue = &pxmitpriv->be_txqueue;
 982                 hwxmits[2] .sta_queue = &pxmitpriv->be_pending;
 983                 pxmitpriv->bk_txqueue.head = 0;
 984                 hwxmits[3] .phwtxqueue = &pxmitpriv->bk_txqueue;
 985                 hwxmits[3] .sta_queue = &pxmitpriv->bk_pending;
 986         }
 987 }
 988
 989 static void free_hwxmits(struct _adapter *padapter)
 990 {
 991         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 992
 993         kfree(pxmitpriv->hwxmits);
 994 }
 995
 996 static void init_hwxmits(struct hw_xmit *phwxmit, sint entry)
 997 {
 998         sint i;
 999
1000         for (i = 0; i < entry; i++, phwxmit++) {
1001                 spin_lock_init(&phwxmit->xmit_lock);
1002                 INIT_LIST_HEAD(&phwxmit->pending);
1003                 phwxmit->txcmdcnt = 0;
1004                 phwxmit->accnt = 0;
1005         }
1006 }
1007
1008 void xmitframe_xmitbuf_attach(struct xmit_frame *pxmitframe,
1009                         struct xmit_buf *pxmitbuf)
1010 {
1011         /* pxmitbuf attach to pxmitframe */
1012         pxmitframe->pxmitbuf = pxmitbuf;
1013         /* urb and irp connection */
1014         pxmitframe->pxmit_urb[0] = pxmitbuf->pxmit_urb[0];
1015         /* buffer addr assoc */
1016         pxmitframe->buf_addr = pxmitbuf->pbuf;
1017         /* pxmitframe attach to pxmitbuf */
1018         pxmitbuf->priv_data = pxmitframe;
1019 }
1020
1021 /*
1022  * tx_action == 0 == no frames to transmit
1023  * tx_action > 0 ==> we have frames to transmit
1024  * tx_action < 0 ==> we have frames to transmit, but TXFF is not even enough
1025  *                                               to transmit 1 frame.
1026  */
1027
1028 int r8712_pre_xmit(struct _adapter *padapter, struct xmit_frame *pxmitframe)
1029 {
1030         unsigned long irqL;
1031         int ret;
1032         struct xmit_buf *pxmitbuf = NULL;
1033         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
1034         struct pkt_attrib *pattrib = &pxmitframe->attrib;
1035
1036         r8712_do_queue_select(padapter, pattrib);
1037         spin_lock_irqsave(&pxmitpriv->lock, irqL);
1038         if (r8712_txframes_sta_ac_pending(padapter, pattrib) > 0) {
1039                 ret = false;
1040                 r8712_xmit_enqueue(padapter, pxmitframe);
1041                 spin_unlock_irqrestore(&pxmitpriv->lock, irqL);
1042                 return ret;
1043         }
1044         pxmitbuf = r8712_alloc_xmitbuf(pxmitpriv);
1045         if (pxmitbuf == NULL) { /*enqueue packet*/
1046                 ret = false;
1047                 r8712_xmit_enqueue(padapter, pxmitframe);
1048                 spin_unlock_irqrestore(&pxmitpriv->lock, irqL);
1049         } else { /*dump packet directly*/
1050                 spin_unlock_irqrestore(&pxmitpriv->lock, irqL);
1051                 ret = true;
1052                 xmitframe_xmitbuf_attach(pxmitframe, pxmitbuf);
1053                 r8712_xmit_direct(padapter, pxmitframe);
1054         }
1055         return ret;
1056 }